Search for dissertations about: "material crack driving force"

Showing result 11 - 15 of 17 swedish dissertations containing the words material crack driving force.

2. 11. Elastic-plastic fracture mechanics - Application to rolling contact fatigue in rails

   Author : Johan Tillberg; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; FEM; rolling contact fatigue; railway mechanics; Elastic-plastic fracture mechanics; material forces;

   Abstract : Railway structures represent complex mechanical problems involving wave propagation, plastic deformations and material degradation. The wheel-rail contact loads subject the material to repeated cycles of complex stress states resulting in rolling contact fatigue (RCF). READ MORE

4. 12. On the Modelling of Fracture Using Strong Discontinuities

   Author : Martin Fagerström; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fracture; strong discontinuity; material forces; finite deformations; FEM;

   Abstract : The major concern of this work is the constitutive and numerical modelling of fracture,based on strong discontinuity formulations. More particularly, an extended finiteelement approach is used, where the total displacement is separated in two mutuallyindependent fields, representing the continuous and discontinuous displacement respectively. READ MORE

5. 13. Crack growth in single crystal nickel base superalloys under isothermal and thermomechanical fatigue

   Author : Frans Palmert; Johan Moverare; David Gustafsson; Mikael Segersäll; Christer Persson; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : This work concerns the fatigue crack growth behaviour of nickel base single crystal superalloys. The main industrial application of this class of materials is in gas turbine blades, where the ability to withstand severe mechanical loading in combination with high temperatures is required. READ MORE

6. 14. Finite Element Procedures for the Numerical Simulation of CRack Propagation and Bilateral Contact

   Author : Per Heintz; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : This thesis concerns finite element methods for the numerical simulation of crack propagation including contact formulations for the contact between deformable bodies. The classical integral formulations for theenergy release rate at crack growth are considered and adaptive algorithms are developed. READ MORE

7. 15. Improved CWM platform for modelling welding procedures and their effects on structural behaviour

   Author : Per Lindström; Lars-Erik Svensson; Lennart Josefson; Hannu Hänninen; Högskolan Väst; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CWM; FEM; WELD; STRESS; EPFM; Manufacturing and materials engineering; Produktions- och materialteknik;

   Abstract : A welding procedure specification is the document describing how a weld joint should be constructed. Arc weld processes are characterized by transient thermal behavior, leading to rapid changes in material properties and dynamic interaction between weld and base material. READ MORE